Based on my experiences using and facing
Rotom-W, I strongly believe that it belongs in
S-Rank and not anything lower. I feel as though the discussion on this pokemon needs more insight, so here's a wall of text.
First I'll start with comparing Rotom-W to the definitions of an S-Rank pokemon as opposed to A or A+ rank:
S Rank: Reserved for Pokemon who can sweep or wall significant portions of the metagame with little support, and Pokemon who can support other Pokemon with very little opportunity cost ("free turns"). Also the home of Pokemon who can easily perform multiple roles effectively, increasing their versatility and unpredictability. If the Pokemon in this rank have any flaws, those flaws are thoroughly mitigated by their substantial strengths. If there are suspects, they will come from this rank.
I don't really need to bold specific statements in this description. Obviously Rotom-W isn't meant to sweep significant portions of the metagame, but acts as a check to nearly half the metagame if I'm not mistaken. It can support its teammates extremely well by preserving momentum and crippling anything that is immune to Volt Switch with WoW and Hydro Pump. It's such a fantastic go-to glue pokemon that has great synergy with a crap ton of other S and A+ rank threats, and thus has very little opportunity cost hence why it's slapped on so many teams.
In terms of versatility, Rotom-W has a bit less than its company in S-rank. Obviously it cant bluff between physical and special sets, but it can run a few items and EV spreads to give it different "roles". Offensive chesto rest can bluff scarf, scarf can cripple with trick, and bulky variants can still run either chesto-rest or leftovers with pain split. Its low HP and solid defenses make it a difficult pokemon to wear down with Pain Split, which is annoying because wearing down Rotom-W is oftentimes the best way to deal with it.
Rotom-W has flaws like any other pokemon, but they are definitely mitigated by its strengths. Its seemingly lackluster stats are mitigated by its perfect "coverage" consisting of Volt Switch, Hydro Pump and WoW, which can be thoroughly dealt with by only Electric-immune pokemon that can take a Hydro Pump and don't care about WoW (in other words Gastrodon and Lanturn). Its low HP is mitigated by the increased recovery of Pain Split. Its lack of versatility is mitigated by not needing to run any other set. Rotom-W is a pokemon that really has no glaring issues.
A Rank: Reserved for Pokemon who can sweep or wall significant portions of the metagame, but require some support or have some flaws that prevents them from doing this consistently. Supporting Pokemon in this rank may give opponents free turns or cannot create free turns easily themselves, but can still do their job most of the time
As for A Rank's description, it's simply inaccurate when applied to Rotom-W. Rotom-W requires no support whatsoever, and does its job consistently without a doubt. In terms of being a supporting pokemon, Rotom-W's movepool allows it so that it
almost never gives opponents free turns. Meanwhile, Rotom-W is very well known for
easily creating free turns and preserving momentum more efficiently than every Pokemon in the tier besides Genesect. There are two instances of Rotom-W not being able to easily create free turns: 1) Its user is too afraid to volt switch because of a present ground type that it can probably just cripple with WoW anyway. 2) The opponent has Gastrodon or Lanturn specifically for Rotom-W, in which case you can often predict a switch anyway.
There were a few points brought up in the previous pages that I should address:
Rotom-W is another thing that I find laughable in S; it's surely good, but what makes it any better than it was last gen? The ability to check Talonflame? It's signature STAB move was nerfed, it got literally 0 new helpful moves, hell even Hidden Power was nerfed. No doubt that it's a very good mon, but S-tier it is not.
Rotom-W received an important buff in regards to WoW accuracy increasing to 85%, which is really significant because Rotom-W is by far the best user of WoW in OU. Other than that, it's true that Rotom-W itself hasn't received much else, but it is still a better mon than it was last gen. The Hydro Pump nerf hardly affects Rotom-W because most pokemon that can take a Hydro Pump will not appreciate either WoW or Volt Switch. Most ground types in OU hate getting burned and/or still cannot take a 110 base power Hydro Pump. Even though Rotom-W is almost the same as it was in gen V, the metagame around it has changed significantly. It just happens to be more effective in this metagame than it was previously, and I'll try to pinpoint a few reasons:
-Checks Talonflame (may counter depending on set)
-Doesn't get worn down by Sandstorm nearly as much
-Doesn't have to deal with rain-boosted special sweepers anymore
-Can also check Aegislash
-Going down the list of A+ and A rank pokemon, Rotom-W seems to match up pretty well against most of them. Just because its a support pokemon doesn't mean it isn't centralizing and doesn't belong in S rank.
Ok, Rotom-W is a fantastic Pokemon but it's not very complicated to weaken it. It can come on many things but only 1 or 2 times especially with Stealth Rock up. It's for sure A/A+ Rank, but definitely not S Rank in my opinion.
Though this was the only reason Ojama provided for why Rotom-W shouldn't be S Rank, I disagree with it for two reasons.
1) It's really not enough of a reason. It's a single statement that also applies to other S Rank pokemon, and Rotom-W is not a wall in the first place.
2) It's not necessarily true. Rotom-W has perfect stats to make use of Pain Split effectively (low hp, high defenses), and the Chesto Rest set is meant to mitigate Rotom-W's ability to be worn down easily. It's difficult for me to say that something can't be worn down easily if it doesn't have a reliable instant-recovery move, but based on my 2000+ ladder experiences it has pretty good survivability and almost always ends up crippling half my opponent's team before (if) it goes down. Also, when facing Rotom-W I always have a tough time getting rid of it when the opponent doesn't sack it unnecessarily. Hell, even Rotom-H lasts a long time with rocks chipping off 25% on every switch-in.
TLDR: Either modify the descriptions of S and A rank or put this Pokemon where it really belongs.
edit:
SmashBrosBrawl most of the arguments you just made were refuted in this post